1991 S10 2.5L throttle body idles too fast. Vacuum lines match the diagram located on top of radiator.
Thanks
A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.
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